Wednesday, 23 December 2015

FIGURE 1. Historical photograph of the skeleton of the holotype
(BRSMG Cb 2335) of Atychodracon megacephalus (Stutchbury, 1846).
Photograph taken from glass plate negative in the Bristol City Museum & Art
Gallery, originally published by Swinton (1948). Bristol City Museum & Art
Gallery, reproduced with permission. Length of skeleton = 4960 mm

Plesiosaurs are an extinct group of
Mesozoic marine reptiles. Their fossil record ranges from the latest Triassic (approx. 200 million years ago) to the latest Cretaceous
(approx. 65 million years ago), and they have a short body with four flippers,
a long neck, and a head full of sharp teeth. They are unlike any modern day
animal and were once described as looking like a snake threaded through the
body of a turtle.

The five metre-long holotype specimen of ‘Plesiosaurus’megacephalus, from the Jurassic
of Street-on-the-Fosse, Somerset, was one of several plesiosaur specimens once displayed in the Bristol City
Museum and Art Gallery during the first half of the 20th Century. As
one of the earliest plesiosaurs to evolve
it is an important species for understanding the early history of the group.
Sadly, the fossil skeleton was destroyed along with many other specimens, when
the museum was struck by a bomb during the Second World War. This destroyed
fossil material is sometimes referred to as the ‘ghost collection’.

All was not lost, however. Moulds of
some of the fossils had been taken before the war. In the case of ‘Plesiosaurus’megacephalus, multiple casts of
its skull and forelimb were produced prior to its destruction, and these had
been deposited in the collections of several other museums (British Geological
Survey, Keyworth; Natural History Museum, London; Trinity College, Dublin).

These casts recently provided a valuable
resource for Dr Adam Smith, Curator of Natural Sciences and a palaeontologist
at the Nottingham Natural History Museum, Wollaton Hall. Smith used the
casts to conduct a research project on the ‘Plesiosaurus’megacephalus, published this
April in the open access journal Palaeontologia Electronica (18.1.20A
p.1-19). The study was facilitated by The Bristol Museum and Art Gallery, who
provided historical photographs of the ‘ghost collection’from their
archives. These show how the fossil skeletons appeared before they were
destroyed (Figure 1). To assist with the project, the British Geological
Survey produced three-dimensional digital laser scans of the casts as part
of their JISC-funded ‘GB3D fossil types
online’project. The
resulting virtual models can be rotated and studied on a computer screen, and
even printed with a 3D printer (Figure 2, 3).

The scientific study shows that ‘Plesiosaurus’ megacephalus is distinct from all other plesiosaurs, including Plesiosaurus, and so it is given a new name, Atychodracon, meaning ’Unfortunate Dragon’. This is in recognition of the unfortunate destruction of the original fossil, as well as the colloquial name ‘Sea Dragon’, sometimes applied to extinct swimming reptiles. The project also shows that fossil casts, and 3D laser scans, provide valuable data for palaeontologists - they can be described, measured, and coded into analyses. When the original fossil material has been lost, damaged or destroyed, the scientific value of casts increases even further. This study is the first publication to make use of the publicly available repository of 3D laser scans provided by the BGS. The Bristol Museum and Art Gallery is now investigating the possibility of using physical representations of their ‘ghost collection’ in future exhibitions, to bring long lost fossils such as Atychodracon ‘back to life’.

awarded to the GB/3D British Type Macrofossils online project, April 2015

As 2015 draws towards its close, it is a time for reflection
on progress and highlights for the year. Work continues on adding and updating
entries. We have, for example, a number of new images to add to existing
entries. We are also keen to discuss with the curators of collections not yet
included how we can add their material. Provided the data is in the correct
format, adding it is fairly simple and quick. We are also looking at ways to
finance extending the database to include figured and cited specimens and other
good representative material to make the database more comprehensive. Crowdfunding
is one method under consideration.

Graph showing monthly visits to the GB/3D website for the
last two years

One highlight has been the growth through the year in visits
to the GB/3D website. After a high of 72,000 visits during September 2013,
immediately after the launch, monthly visits declined to 2,500 a year ago – but
they have been rising steadily through 2015 and have now been over 4,000 for
several months. Such behaviour is well documented in project cycles – we have
been through the peak of “euphoria” and the trough of “despondency” and are hopefully entering a prolonged period of “optimism”.

Another highlight has been the coining of the first GB/3D DOIs for three casts of sections of 'Plesiosaurus' megacephalus in a recent Palaeontologica Electronica paper by Adam S. Smith - see http://palaeo-electronica.org/content/2015/1146-plesiosaurus-megacephalus . Adam has prepared a guest blog on the subject.

The main highlight of the year was the receipt of the
International Data Rescue Award in the Geosciences, presented at EGU in Vienna,
in April.

The award was created to improve the prospects for preservation and
access of research data, particularly of dark data, and to share the varied ways
that these data are being processed, stored, and used. Lack of access may be
due to the nature of the formatting (e.g., analogue data, magnetic tapes that
lack format description) or the nature of the data curation and/or organization
(e.g., no formal database repository, no backup), such that those data cannot
be shared. Consequently, the progress of research suffers unless extra steps
are taken to recover the data or transform them to a dependable electronic
media.

In our case, the award marked the provision of a single database to
locate type material in numerous museum collections, and to facilitate access
by providing high resolution images and stereo-anaglyphs, and in many cases, 3d
digital models.